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// Properties of Math.tanh that are guaranteed by the spec.
// If x is NaN, the result is NaN.
assertEq(Math.tanh(NaN), NaN);
// If x is +0, the result is +0.
assertEq(Math.tanh(+0), +0);
// If x is −0, the result is −0.
assertEq(Math.tanh(-0), -0);
// If x is +∞, the result is +1.
assertEq(Math.tanh(Number.POSITIVE_INFINITY), +1);
// If x is −∞, the result is -1.
assertEq(Math.tanh(Number.NEGATIVE_INFINITY), -1);
reportCompare(0, 0, "ok");